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    6．On the morning of October 12，1492，Christopher Columbus and his crew came to the shores of the Caribbean islands，mistakenly believing they ________ in Southeast Asia．（　　）
    A．arrivedB．had arrivedC．has arrivedD．would arrive

    分析 在1492年10月12日的早晨，哥伦布和他的船员到达了加勒比海岸，他们误认为自己到了东南亚．

    解答 答案；B．因为arrive发生在mistakenly believing 之前，表示"过去的过去"，所以用过去完成时态．所以答案是B．其他选项的时态分别是A一般过去时态；C选择完成时态；D过去将来时态．

    点评 考查过去完成时态．
    过去完成时（The Past Perfect Tense）：表示过去某一时间或动作以前已经发生或完成了的动作对过去的某一点造成的某种影响或是结果，用来指在另一个过去行动之前就已经完成了的事件．它表示动作发生的时间是"过去的过去"，侧重事情的结果．

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